US8630276B2 - Method of transmitting control information for performing HARQ process in wireless communication system supporting plurality of transmission bands - Google Patents

Method of transmitting control information for performing HARQ process in wireless communication system supporting plurality of transmission bands Download PDF

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US8630276B2
US8630276B2 US13/133,330 US200913133330A US8630276B2 US 8630276 B2 US8630276 B2 US 8630276B2 US 200913133330 A US200913133330 A US 200913133330A US 8630276 B2 US8630276 B2 US 8630276B2
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bit field
hps
information
control information
transmission bands
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US20110249601A1 (en
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Dong Youn Seo
Suck Chel Yang
Jung Hoon Lee
Joon Kui Ahn
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated

Definitions

  • the present invention relates to a method of transmitting control information for performing a Hybrid Automatic Repeat Request (HARQ) process in a wireless communication system supporting a plurality of transmission bands.
  • HARQ Hybrid Automatic Repeat Request
  • FIG. 1 is a diagram illustrating physical channels used in a 3 rd Generation Project Partnership (3GPP) LTE system (Evolved Universal Terrestrial Radio Access (E-UTRA), Release 8) which is an example of a mobile communication system, and a general signal transmission method using the same.
  • 3GPP 3 rd Generation Project Partnership
  • LTE Long Term Evolution
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • a User Equipment which newly enters a cell upon being turned on, performs an initial cell search operation such as synchronization with a base station in step S 101 .
  • the UE may receive a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronize with the base station, and acquire information such as a cell ID.
  • the UE may receive a Physical Broadcast Channel (PBCH) from the base station and acquire broadcasting information in the cell.
  • PBCH Physical Broadcast Channel
  • the UE may receive a downlink Reference Signal (RS) and check a downlink channel state in the initial cell search step.
  • PBCH Physical Broadcast Channel
  • RS downlink Reference Signal
  • the UE which completes the initial cell search operation may receive a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH) according to the PDCCH information and acquire detailed system information in step S 102 .
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • the UE which does not complete the access to the base station may perform a random Access Procedure in steps 103 to S 106 , in order to complete the access to the base station.
  • the UE may transmit a feature sequence through a Physical Random Access Channel (PRACH) as a preamble (S 103 ) and receive a response message to the random access through the PDCCH and the PDSCH corresponding thereto (S 104 ).
  • PRACH Physical Random Access Channel
  • S 104 receive a response message to the random access through the PDCCH and the PDSCH corresponding thereto
  • a contention resolution procedure including transmission (S 105 ) of an additional PRACH and reception (S 106 ) of the PDCCH and the PDSCH corresponding thereto may be performed.
  • the UE which performs the above-described procedure may perform reception (S 107 ) of the PDCCH/PDSCH and transmission (S 108 ) of a Physical Uplink Shared Channel (PUSCH)/Physical Uplink Control Channel (PUCCH) as a general uplink/downlink signal transmission procedure.
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • OFDM Orthogonal Frequency Division Multiplexing
  • 3GPP supports a type 1 radio frame structure applicable to Frequency Division Duplex (FDD) and a type 2 radio frame structure applicable to Time Division Duplex (TDD).
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • FIG. 2 is a diagram showing the type 1 radio frame structure.
  • the type 1 radio frame includes 10 subframes and one subframe includes two slots.
  • FIG. 3 is a diagram showing the type 2 radio frame structure.
  • the type 2 radio frame includes two half frames and each half frame includes five subframes, a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP) and an Uplink Pilot Time Slot (UpPTS).
  • DwPTS Downlink Pilot Time Slot
  • GP Guard Period
  • UpPTS Uplink Pilot Time Slot
  • one subframe includes two slots.
  • the DwPTS is used for initial cell search, synchronization or channel estimation of a terminal.
  • the UpPTS is used for channel estimation of a base station and uplink transmission synchronization of a terminal.
  • the GP is used to eliminate interference generated in uplink due to multi-path delay of a downlink signal between uplink and downlink. That is, one subframe includes two slots regardless of the type of the radio frame.
  • FIG. 4 is a diagram showing an LTE downlink slot structure.
  • a signal transmitted by each slot may be expressed by a resource grid including N RB DL N SC RB subcarriers and N symb DL OFDM symbols.
  • N RB DL denotes the number of Resource blocks (RBs) in downlink
  • N SC RB denotes the number of subcarriers configuring one RB
  • N symb DL denotes the number of OFDM symbols in one downlink slot.
  • FIG. 5 is a diagram showing an LTE uplink slot structure.
  • a signal transmitted by each slot may be expressed by a resource grid including N RB UL N SC RB subcarriers and N symb UL OFDM symbols.
  • N RB UL denotes the number of RBs in uplink
  • N SC RB denotes the number of subcarriers configuring one RB
  • N symb UL denotes the number of OFDM symbols in one uplink slot.
  • a resource element is a resource unit defined as an index (a, b) within the uplink slot and the downlink slot and indicates one subcarrier and one OFDM symbol.
  • a denotes an index on a frequency axis
  • b denotes an index on a time axis.
  • one base station transmits or receives data to or from a plurality of terminals in one cell or sector in a radio channel environment.
  • the base station receives packet traffic from a wired Internet network and transmits the received packet traffic to the terminals using a predetermined communication scheme.
  • determination as to when the base station transmits data to which of the terminals using which frequency band is called downlink scheduling.
  • the base station demodulates data received from a terminal using a predetermined communication scheme and transmits packet traffic to the wired Internet network.
  • Uplink scheduling Determination as to when the base station allows which of the terminals to transmit uplink data using which frequency band is called uplink scheduling.
  • a terminal having a good channel state transmits or receives data using considerable time and frequency resources.
  • FIG. 6 is a diagram showing time and frequency RBs in time and frequency domains.
  • the resource of the system operated in the multi-carrier form or the form similar thereto may be largely classified into a time domain and a frequency domain.
  • the resource may be defined by an RB, which is composed of any N subcarriers and any M subframes or a predetermined time unit. At this time, N and M may be 1.
  • One rectangle of FIG. 6 denotes one RB, and one RB is formed by N subcarriers on one axis and the predetermined time unit on the other axis.
  • the base station schedules one or more RBs to a selected terminal according to a predetermined scheduling rule and the base station transmits data using the RBs allocated to the terminal.
  • the base station allocates one or more RBs to a selected terminal according to a predetermined scheduling rule and the terminal transmits data in uplink using the allocated resource.
  • a scheme for controlling an error when a frame is lost or damaged after scheduling is performed and data is transmitted includes an Automatic Repeat Request (ARQ) scheme and a Hybrid ARQ (HARQ) scheme.
  • ARQ Automatic Repeat Request
  • HARQ Hybrid ARQ
  • a transmitter waits for an Acknowledgement (ACK) signal after transmitting one frame and a receiver transmits the ACK signal only when the frame is normally received without error. If an error occurs in the frame, the receiver transmits a Negative-ACK (NAK) and the frame in which the error occurs is deleted from a buffer of the receiver.
  • NAK Negative-ACK
  • the transmitter transmits a subsequent frame when receiving the ACK signal and retransmits the frame when receiving the NAK signal.
  • the receiver transmits the NAK signal to the transmitter, but the received frame is stored in the buffer during a predetermined period of time. Then, when the frame is retransmitted, the retransmitted frame is combined with the previously received frame so as to increase a successful reception ratio.
  • the HARQ scheme includes various schemes and may be broadly classified into a synchronous HARQ scheme and an asynchronous HARQ.
  • the HARQ scheme may be classified into a channel-adaptive HARQ scheme and a channel-non-adaptive HARQ scheme, depending on whether the amount of resources used for retransmission is adjusted according to channel states.
  • retransmission is performed at a timing determined by a system. That is, if it is assumed that the retransmission is performed in every fourth time unit after the initial transmission fails, since the timing when the retransmission is performed is previously determined between the base station and the terminal, the timing when the retransmission is performed does not need to be reported.
  • a data transmission side receives a NAK message, the frame is retransmitted in every fourth time unit until an ACK message is received.
  • retransmission timing is determined by new scheduling or additional signaling.
  • the retransmission timing of the frame which has previously failed to be transmitted may be changed by various factors such as a channel state.
  • modulation of the frame, the number of used RBs, and Adaptive Modulation and Coding (AMC), all of which are determined at the time of initial transmission, are used at the time of retransmission without change.
  • AMC Adaptive Modulation and Coding
  • the modulation of the frame, the number of used RBs, and the AMC are changed according to the channel state. For example, in the channel-non-adaptive HARQ scheme, a transmitter transmits data using six RBs in initial transmission and retransmits data using six RBs in retransmission.
  • the channel-adaptive HARQ scheme even when data is transmitted using six RBs in initial transmission, the data may be retransmitted using RBs less or greater in number than 6 according to the channel state. Based on such classification, a combination of the four HARQ schemes may be considered, but the mainly used HARQ schemes include an asynchronous channel-adaptive HARQ scheme and a synchronous channel-non-adaptive HAQR scheme.
  • the retransmission timing and the amount of resources are adaptively changed according to the channel state so as to maximize retransmission efficiency.
  • this scheme is not considered in uplink.
  • the asynchronous HARQ scheme is used in downlink and the synchronous HARQ scheme is used in uplink.
  • FIG. 7 is a diagram illustrating resource allocation and retransmission of the asynchronous HARQ scheme.
  • time delay occurs as shown in FIG. 7 while scheduling is performed, data is transmitted, ACK/NAK information is received from a terminal, and next data is transmitted. This time delay occurs due to channel propagation delay and time consumed for data decoding and data encoding.
  • a transmission method using independent HARQ processes is used for gapless data transmission during a delay period. For example, if a shortest period from current data transmission to next data transmission is 7 subframes, data can be transmitted by performing 7 independent processes without gap. In the LTE, a maximum of 8 processes may be allocated if a Multiple Input Multiple Output (MIMO) scheme is not used.
  • MIMO Multiple Input Multiple Output
  • FIG. 8 is a diagram illustrating a frequency band used in a system supporting multi-carrier.
  • multi-carrier denotes the entire frequency band used by the base station and is equal to the whole band.
  • the multi-carrier may be 100 MHz.
  • the CC refers to an element carrier configuring the multi-carrier. That is, a plurality of CCs configures a multi-CC through carrier aggregation.
  • the CC includes a plurality of lower bands. At this time, if the term ‘multi-carrier’ is replaced with the term ‘whole band’.
  • CC aggregation is also called bandwidth aggregation. As a subband, the lower band may be replaced with a partial band.
  • the carrier aggregation can extend a bandwidth by collecting a plurality of carriers in order to increase a data rate. For example, in the existing system, one carrier is 20 MHz. However, the bandwidth can be extended to 100 MHz by collecting five carriers each having 20 MHz.
  • the carrier aggregation includes aggregation of carriers located in different frequency bands.
  • An object of the present invention devised to solve the problem lies on a method of configuring HARQ processes in a wireless communication system supporting multi-carrier.
  • the object of the present invention can be achieved by providing a method of transmitting control information for performing a Hybrid Automatic Repeat Request process in a wireless communication system supporting a plurality of transmission bands, the method including generating the control information including HARQ Process Set (HPS) information indicating a specific HPS of a plurality of HPSs corresponding to the plurality of transmission bands, and transmitting the generated control information to a user equipment.
  • HPS HARQ Process Set
  • the HPS information may be included in a bit field for the HPS information in the control information.
  • the bit field may be composed of
  • control information may include an adjustment flag, and a predetermined bit field may be used as a bit field for transmitting the HPS information, according to a value of the adjustment flag.
  • the predetermined bit field may correspond to one of a bit field indicating a Redundancy Version (RV), a bit field indicating a Modulation and Coding Scheme (MCS), and a bit field indicating both the RV and the MCS.
  • RV Redundancy Version
  • MCS Modulation and Coding Scheme
  • control information may include a bit field indicating a Modulation and Coding Scheme (MCS) and a Redundancy Version (RV) and a bit field for a Resource Indication Value (RIV), and, if a value included in the bit field for the RIV is an unused value, the bit field indicating the MCS and the RV may be used as a bit field for transmitting the HPS information.
  • MCS Modulation and Coding Scheme
  • RV Redundancy Version
  • RV Resource Indication Value
  • the specific HPS may include a predetermined number of independent HARQ processes in a predetermined period
  • the control information further may include HARQ Process Number (HPN) information indicating a specific HARQ process of the predetermined number of independent HARQ processes.
  • HPN HARQ Process Number
  • the plurality of transmission bands may include five contiguous or discontiguous transmission bands.
  • a user equipment in a wireless communication system supporting a plurality of transmission bands including a Radio Frequency (RF) unit configured to receive control information including HARQ Process Set (HPS) information indicating a specific HPS of a plurality of HPSs corresponding to the plurality of transmission bands, and a processing unit configured to control HARQ process using the HPS information included in the received control signal, the processing unit being connected electrically to the RF unit.
  • RF Radio Frequency
  • the HPS information may be included in a bit field for the HPS information in the control information.
  • the bit field may be composed of
  • control information may include an adjustment flag
  • processing unit may recognize a predetermined bit field as a bit filed for transmitting the HPS information, according to a value of the adjustment flag.
  • the predetermined bit field may correspond to one of a bit field indicating a Redundancy Version (RV), a bit field indicating a Modulation and Coding Scheme (MCS), and a bit field indicating both the RV and the MCS.
  • RV Redundancy Version
  • MCS Modulation and Coding Scheme
  • control information may include a bit field indicating a Modulation and Coding Scheme (MCS) and a Redundancy Version (RV) and a bit field for a Resource Indication Value (RIV), and, if a value included in the bit field for the RIV is an unused value, the processing unit recognizes the bit field indicating the MCS and the RV as a bit field for transmitting the HPS information.
  • MCS Modulation and Coding Scheme
  • RV Redundancy Version
  • RIV Resource Indication Value
  • the specific HPS may include a predetermined number of independent HARQ processes in a predetermined period
  • the control information further may include a HARQ Process Number (HPN) information indicating a specific HARQ process of the predetermined number of independent HARQ processes.
  • HPN HARQ Process Number
  • the plurality of transmission bands includes five contiguous or discontiguous transmission bands.
  • HARQ processes can be efficiently performed.
  • FIG. 1 is a diagram illustrating physical channels used in a 3 rd Generation Project Partnership (3GPP) LTE system (Evolved Universal Terrestrial Radio Access (E-UTRA), Release 8) which is an example of a mobile communication system and a general signal transmission method using the same.
  • 3GPP 3 rd Generation Project Partnership
  • LTE Long Term Evolution
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • FIG. 2 is a diagram showing a type 1 radio frame structure.
  • FIG. 3 is a diagram showing a type 2 radio frame structure.
  • FIG. 4 is a diagram showing an LTE downlink slot structure.
  • FIG. 5 is a diagram showing an LTE uplink slot structure.
  • FIG. 6 is a diagram showing time and frequency RBs in time and frequency domains.
  • FIG. 7 is a diagram illustrating resource allocation and retransmission of an asynchronous HARQ scheme.
  • FIG. 8 is a diagram illustrating a frequency band used in a system supporting multi-carrier.
  • FIG. 9 is a diagram illustrating downlink and uplink frequency bands during communication between a base station and a User Equipment (UE) in a system supporting only one transmission band.
  • UE User Equipment
  • FIG. 10 is a diagram illustrating downlink and uplink frequency bands during communication between a base station and a UE in a system supporting a plurality of transmission bands.
  • FIG. 11 is a diagram illustrating matching of independent HARQ Process Sets (HPSs) to Component Carriers (CCs) according to an embodiment of the present invention.
  • FIG. 12 is a diagram illustrating a method of configuring independent HPSs according to CCs and freely mapping the HPSs to the CCs according to an embodiment of the present invention.
  • FIG. 13 is a diagram showing a field architecture of control information including a field indicating an HPS according to an embodiment of the present invention.
  • FIG. 14 is a diagram showing a field architecture of control information including a CC adjustment flag according to an embodiment of the present invention.
  • FIG. 15 is a diagram showing a field architecture of control information in which a Modulation and Coding Scheme/Redundancy version (MCS/RV) bit field is used as a bit field indicating an HPS using an unused Resource Indication Value (RIV), according to an embodiment of the present invention.
  • MCS/RV Modulation and Coding Scheme/Redundancy version
  • FIG. 16 is a diagram showing a field architecture of control information including a field indicating an HPS according to an embodiment of the present invention.
  • FIG. 17 is a diagram showing a field architecture of control information including a CC adjustment flag according to an embodiment of the present invention.
  • FIG. 18 is a diagram showing a field architecture of control information including a CC adjustment flag according to an embodiment of the present invention.
  • FIG. 19 is a diagram showing a field architecture of control information including a CC adjustment flag according to an embodiment of the present invention.
  • FIG. 20 is a diagram showing a field architecture of control information in which an RV bit field is used as a field indicating an HPS using a MCS value, according to an embodiment of the present invention.
  • FIG. 21 is a block diagram showing the configuration of a device according to the present invention which is applicable to a UE or a base station.
  • FIG. 9 is a diagram illustrating downlink and uplink frequency bands during communication between a base station and a User Equipment (UE) in a system supporting only one transmission band. As shown in FIG. 9 , transmission or reception is performed between the base station and the UE through one frequency band in the existing system. If an adjacent frequency band is present and transmission or reception is performed using the adjacent frequency band, handover of the frequency band is performed by an inter-frequency handover procedure such that transmission or reception is performed.
  • UE User Equipment
  • FIG. 10 is a diagram illustrating downlink and uplink frequency bands during communication between a base station and a UE in a system supporting a plurality of transmission bands.
  • the system of the present invention supports a plurality of Component Carriers (CCs). That is, in the system of the present invention, one UE may simultaneously transmit or receive a plurality of CCs or selectively transmit or receive some of the plurality of CCs. If independent HARQ processes are configured between the CCs, the following transmission methods may be used in consideration of burden of a control signal and retransmission efficiency.
  • CCs Component Carriers
  • HPS HARQ Process Sets
  • the HPS refers to a group of a predetermined number of independent HARQ processes.
  • the 8 independent processes may be defined as one HPS.
  • FIG. 11 is a diagram illustrating matching of independent HPSs to CCs according to an embodiment of the present invention.
  • independent HPSs specifically, five HPSs: A, B, C, D and E
  • HPN HARQ Process Number
  • N may correspond to the number of buffers for performing the independent HARQ processes.
  • a downlink control signal for scheduling a PDSCH may be configured to freely control the PDSCH of a certain downlink CC regardless of the downlink CC through which a PDCCH including the downlink control signal is transmitted.
  • an uplink control signal may be configured to freely control a PUSCH of a certain CC regardless of a downlink CC through which a PDCCH including a downlink control signal is transmitted.
  • the downlink control signal for scheduling the PDSCH and the uplink control signal for scheduling the PUSCH may include downlink CC information and uplink CC information to which scheduling will be applied, respectively.
  • a method of constructing independent HPSs according to the number of CCs and freely mapping the HPSs to the CCs is provided.
  • FIG. 12 is a diagram illustrating a method of configuring independent HPSs according to CCs and freely mapping the HPSs to the CCs according to an embodiment of the present invention.
  • an HPS and an HPN are indicated by a downlink or uplink control signal for controlling a specific CC so as to use a process corresponding thereto. For example, if an HPS of a control signal of a CC B is C and an HPN is 2, a HARQ process (C, 2) is indicated. At this time, in initial transmission, it is meaningless for an HPS to be selectively used.
  • the HPS is matched to a CC having a good channel and data is transmitted through the CC, thereby increasing data reception rate. Accordingly, matching between a specific CC and a specific HPS may be fixed and used in the initial transmission, and the HPS is indicated only in the retransmission.
  • the HPN Since the synchronous HARQ scheme is used in uplink, the HPN is interlock with an uplink time. Accordingly, a control signal for the HPN is not necessary, but a signal indicating the HPS is necessary.
  • the following methods are suggested as a method of configuring the signal indicating the HPS.
  • the number of CCs is s.
  • FIG. 13 is a diagram showing a field architecture of control information including a field indicating an HPS according to an embodiment of the present invention. As shown in FIG. 13 , the HPS may be explicitly indicated using an explicit HPS bit field. At this time,
  • ′ denotes a ceiling function
  • FIG. 14 is a diagram showing a field architecture of control information including a CC adjustment flag according to an embodiment of the present invention. As shown in FIG.
  • the MCS/RV value is analyzed as the existing MCS/RV value if the CC adjustment flag is 0 and the MCS/RV value is analyzed as the value indicating the HPS if the CC adjustment flag is 1.
  • the RV since the existing RV field is used for another purpose, the RV cannot be newly set. At this time, the RV may be used in order of 0, 2, 3 and 1, similar to the existing synchronous scheme.
  • FIG. 15 is a diagram showing a field architecture of control information in which an MCS/RV bit field is used as a bit field indicating an HPS using an unused RIV, according to an embodiment of the present invention.
  • the MCS/RV value indicates the existing MCS/RV value if the RIV is a valid RIV
  • the MCS/RV value indicates the HPS if the RIV is the unused RIV value. Since resource allocation using the RIV is necessary in the initial transmission, the unused RIV is available only in the retransmission. At this time, resource allocation follows previous transmission.
  • the HPN is included in the downlink control signal and additional HPS signaling is necessary.
  • FIG. 16 is a diagram showing a field architecture of control information including a field indicating an HPS according to an embodiment of the present invention. As shown in FIG. 16 , the HPS may be explicitly indicated using an explicit HPS bit field. At this time,
  • ′ denotes a ceiling function
  • FIG. 17 is a diagram showing a field architecture of control information including a CC adjustment flag according to an embodiment of the present invention. As shown in FIG.
  • the RV value is analyzed as the existing RV value if the CC adjustment flag is 0 and the RV value is analyzed as the value indicating the HPS if the CC adjustment flag is 1. Since the RV has 2 bit and thus can express only four states, if the number of CCs is 5, the HPS can be indicated only in the retransmission and a previously matched set should be used in the initial transmission.
  • FIG. 18 is a diagram showing a field architecture of control information including a CC adjustment flag according to an embodiment of the present invention. As shown in FIG.
  • the MCS value is analyzed as the existing MCS value if the CC adjustment flag is 0 and the MCS value is analyzed as the value indicating the HPS if the CC adjustment flag is 1.
  • FIG. 19 is a diagram showing a field architecture of control information including a CC adjustment flag according to an embodiment of the present invention. As shown in FIG.
  • the MCS/RV value is analyzed as the existing MCS/RV value if the CC adjustment flag is 0 and the MCS/RV value is analyzed as the value indicating the HPS if the CC adjustment flag is 1.
  • FIG. 20 is a diagram showing a field architecture of control information in which an RV bit field is used as a field indicating an HPS using a MCS value according to an embodiment of the present invention.
  • the MCS value is ignored and s states of the existing RV bit field are analyzed not as the RV value but as the value indicating the HPS.
  • a specific combination is applied only to the retransmission.
  • FIG. 21 is a block diagram showing the configuration of a device according to the present invention which is applicable to a UE or a base station.
  • the device 210 includes a processing unit 211 , a memory unit 212 , a Radio Frequency (RF) unit 213 , a display unit 214 and a user interface unit 215 .
  • a physical interface protocol layer is performed by the processing unit 211 .
  • the processing unit 211 provides a control plane and a user plane. The functions of the layers may be performed by the processing unit 211 .
  • the memory unit 212 is electrically connected to the processing unit 211 and stores an operating system, an application and a general file.
  • the display unit 214 can display a variety of information and can be implemented by a Liquid Crystal Display (LCD), an Organic Light Emitting Diode (OLED) or the like.
  • the user interface unit 215 may be combined with a known user interface such as a keypad or a touch screen.
  • the RF unit 213 is electrically connected to the processing unit 211 and transmits or receives an RF signal.
  • the UE including the configuration of the above-described device receives control information including an HPS and an HPN (which may be included only in downlink) from a base station and performs a HARQ process between the base station and the UE.
  • control information including an HPS and an HPN (which may be included only in downlink) from a base station and performs a HARQ process between the base station and the UE.
  • the embodiments of the present invention can be implemented by a variety of means, for example, hardware, firmware, software, or a combination thereof.
  • the present invention can be implemented with application specific integrated circuits (ASICs), Digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), a processor, a controller, a microcontroller, a microprocessor, etc.
  • ASICs application specific integrated circuits
  • DSPs Digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processor a controller, a microcontroller, a microprocessor, etc.
  • the present invention can be implemented in the form of a variety of formats, for example, modules, procedures, functions, etc.
  • the software code may be stored in a memory unit so as to be driven by a processor.
  • the memory unit is located inside or outside of the processor, so that it can communicate with the aforementioned processor via a variety of well-known means.
  • the present invention may be applied to a terminal, a base station or the other equipments of a wireless mobile communication system.

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  • Mobile Radio Communication Systems (AREA)
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